Pacquiao v Marquez 4

LAS VEGAS, NV - DECEMBER 08: Juan Manuel Marquez walks to the ring to take on Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: Manny Pacquiao in the ring while taking on Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - DECEMBER 08: (L-R) Juan Manuel Marquez throws a left to the face of Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (R-L) Juan Manuel Marquez lands a right to the face of Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - DECEMBER 08: (R-L) Manny Pacquiao throws a right at Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (L-R) Juan Manuel Marquez throws a left to the face of Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (R-L) Juan Manuel Marquez lands a right to the face of Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (R-L) Manny Pacquiao throws a right at Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (R-L) Manny Pacquiao throws a left at Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: (L-R) Manny Pacquiao throws a left at Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: Manny Pacquiao is knocked down in the third round while taking on Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

LAS VEGAS, NV - DECEMBER 08: (L-R) Juan Manuel Marquez throws a left at Manny Pacquiao during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

BOXING-US-PACQUIAO-MARQUEZ

Manny Pacquiao (L) falls to the canvas after being knocked down by Juan Manuel Marquez in the 3rd round of their welterweight fight on December 8, 2012 at the MGM Grand Garden in Las Vegas, Nevada. Marquez knocked out Pacquiao in the 6th round. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

BOXING-US-PACQUIAO-MARQUEZ

Juan Manuel Marquez (L) and Manny Pacquiao battle during their welterweight fight on December 8, 2012 at the MGM Grand Garden in Las Vegas, Nevada. Marquez knocked out Pacquiao in the 6th round. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

Manny Pacquiao (L) and Juan Manuel Marquez battle during their welterweight fight on December 8, 2012 at the MGM Grand Garden in Las Vegas, Nevada. Marquez knocked out Pacquiao in the 6th round. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: Manny Pacquiao lays face down on the mat after being knocked out in the sixth round by Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

BOXING-US-PACQUIAO-MARQUEZ

Referee Kenny Bayless (C) holds back Juan Manuel Marquez (R) as Manny Pacquiao (L) lies face down on the mat after being knocked out by Juan Manuel Marquez on December 8, 2012, at the MGM Grand Garden in Las Vegas, Nevada. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: Manny Pacquiao lays face down on the mat after being knocked out in the sixth round as Juan Manuel Marquez celebrates during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

BOXING-US-PACQUIAO-MARQUEZ

Hands reach in ringside to support the head of Manny Pacquiao after he was knocked out by Juan Manuel Marquez on December 8, 2012, at the MGM Grand Garden in Las Vegas, Nevada. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

Manny Pacquiao v Juan Manuel Marquez

LAS VEGAS, NV - DECEMBER 08: Manny Pacquiao lays face down on the mat after being knocked out in the sixth round as Juan Manuel Marquez celebrates during their welterweight bout at the MGM Grand Garden Arena on December 8, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

BOXING-US-PACQUIAO-MARQUEZ

Juan Manuel Marquez celebrates after he knocked out Manny Pacquiao in the 6th round of their welterweight fight on December 8, 2012, at the MGM Grand Garden in Las Vegas, Nevada. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

Juan Manuel Marquez waves to the crowd after knocking out Manny Pacquiao in the 6th round of their welterweight fight on December 8, 2012, at the MGM Grand Garden in Las Vegas, Nevada. AFP PHOTO / John Gurzinski (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)